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atroni [7]
3 years ago
9

Need answer today!!!

Chemistry
1 answer:
scoray [572]3 years ago
5 0

Answer:

Calcium for 2+ charge and Fluorine forms 1- charge

Explanation:

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What is the study of clouds called?
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I really need an answer by tonight!
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The water cycle iss a process which helps to circulate and replenish water on earth.

<h3>What is hydrology?</h3>

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2 years ago
What mass of solute must be used to prepare 500ml of 0.100M aqueous sodium borate Na2B4O7 from solid hydrated sodium borate Na2B
motikmotik

0.000132 g of hydrated sodium borate (Na₂B₄O₇ · 10 H₂O)

Explanation:

First we need to find the number of moles of sodium borate (Na₂B₄O₇) in the solution:

molar concentration = number of moles / volume (L)

number of moles = molar concentration × volume (L)

number of moles of Na₂B₄O₇ = 0.1 × 0.5 = 0.05 moles

We know now that we need 0.05 moles of hydrated sodium borate (Na₂B₄O₇ · 10 H₂O) to make the solution.

Now to find the mass of hydrated sodium borate we use the following formula:

number of moles = mass / molar weight

mass =  number of moles × molar weight

mass of hydrated sodium borate = 0.05 / 381 = 0.000132 g

Learn more about:

molar concentration

brainly.com/question/14106518

#learnwithBrainly

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